public class Example21 {
    public static void main(String[] args) {
        int sum1 = add(1,2);
        int sum2 = add(1,2,3);
        double sum3 = add(1.2,2.3);
        System.out.println("sum1 = " + sum1);
        System.out.println("sum2 = " + sum2);
        System.out.println("sum3 = " + sum3);
    }
    public static int add(int x, int y){
        return x + y;
    }

    public static int add(int x, int y, int z){
        return x + y + z;
    }
    public static double add(double x,double y){ return x+y; }
}
